Core-making machine.



No. 698,767. Patented Apr. 29, I902.

G. H. WADSWORTH &. E. J. SHERWIN.

com: MAKING MACHINE.

(Application filed Dec. 5, 1901.)

(No mam.)

INVENTORS fi m. an (10% *zxwdm I By W ATTORNEY.

UNITED STATES GEORGE 11. WADSWORTH PATENT 'EEICE.

AND EDWARD J. SI-IERWIN, OF CUYAHOGA FALLS, OHIO.

CORE-MAKING MACHINE.

SPECIFICATION formingpart of Letters Patent NO. 698,767, dated. April 29, 1902. Application filed December 5, 1901. Serial No. 84,763. (No model.)

To all whom it may concern:

Be it known that we, GEORGE I-I. WADS- WORTH and EDW'ARD J. SHERWIN, citizens of the United States, residing at Cuyahoga Falls, Summit county, State of Ohio, have invented certain new and useful Improvements in Core- Making Machines, of which the following is a full, clear, and exact specification, such as will enable those skilled in the art to which it appertains to make and use the same.

Ourinvention relates to a machine for making cores, and it relates particularly to machines for forming a hollow core, or, in other fication, Figure I is an end view of the improved core-making machine with the powerwheel and lower gear removed. Fig. II is a side view of the machine, showing the upper parts in central vertical section.-

Similar characters represent similar parts in the drawings and specification.

Referring to the drawings, A represents the body-casting of the machine, which consists of the sand-hopper a in open communication with the cylindrical portion a, an extension a adapted to receive the core-die c, the extension a which forms a bearing for the pinion d, and the supports a a bis a cap threaded into the extension a? for holding the die 0 rigidly in place. Within the cylinder a is a differential screw 6, the shaft of which is keyed or otherwise rigidly secured to the pinion d. The shaft of the screw 9 has a hole through the center thereof, said hole extending the entire length of the shaft. A rod g passes through the opening in the shaft of the differential screw, the forward end g of said rod extending into the core-die c any desired distance and the rear end g extending out of the end of the shaft and rigidly locked to a plate 12, which forms a bearing for the outer end of the pinion-hub d. The mode of looking the rod g to the plate a as illustrated in the drawings is by bend ing the end of said rod downward and under said plate. This is a simple and effective way of locking the rod to prevent its revolution with the diiferential screw; but I wish it to be understood that any manner of fastening the rod so that it will not revolve is within the scope of theinvention. The operatingwheel w, rigidly attached to the gear-wheel dis mounted on a fixed shaft, which is secured to the bed B of the machine. The gear 2' is in mesh with the pinion d.

The operation of the machine is as follows: By turning the operating-wheel w in the proper direction the differential screw is caused to revolve and force the sand into the core-die. This is brought about by the gear 1', attached to the operating-wheel w and in mesh with the pinion d, the shaft of the differential screw being rigidly attached to said pinion (Z, the revolution of the screw around the rod g, said rod remaining stationary, insures a perfectly-centered vent=hole in the core. If-the vent-former were rigid with the screw, the material as it leavesthe end of the thread on the screw would cause uneven wear on the said vent-former, an excess of wear coming on said vent-former at the point where the thread ends and where the former begins, while the revolution of the screw around the stationary rod 9 distributes the wear the full length of said rod.- Still another and an important advantage is the following: It is often desired to form a core with a spindle therein. By the use of the improved core-making machine the rod 9 may be extended through the core any desired distance, and after the core is molded around the rod the rear end of the rod may be out OE and the rod, with core molded thereon, removed from the machine.

The rod then forms the spindle, and another rod may be inserted in the machine at small cost.

A well-known fact to all who are familiar with core-making is the difficulty of mixing the material to insure a uniform and homogeneous core throughout, the nature of the material being such that it does not flow freely, but has a tendency to pack. Therefore the differential screw used in the improved machine is a prominent element of the invention inasmuch as it provides a perfect mixer and insures a steady pressure. If the thread of the screw were the same diameter throughout, the material carried forward by said screw would clog at the mouth of the die owing to the excess of material packed around the stem of the screw and under the steady pressure of the larger thread of the screw. By the use of the differential screw the excess material as it reaches the smaller thread 6 of the screw is thrown off, backs up, and mixes more evenly with the material back of it. The larger thread that receives the material from the hopper a provides the steady pressure of the material, while the tapering of the screw down to the smaller part 6 allows suflicient clearance between the screw and the casing to permit the excess material to free itself from the screw and become thoroughly mixed, thus'insuring a uniform core when the material is forced into the die.

Having now described ourinvention, what we claim, and desire to secure by Letters Patent, is-

In a core-making machine in combination, a cylindrical casing in open communication with a hopper, a die attached to the outlet of the casing, a difierential" screw within said casing, the thread diameter of the screw being largest at the inlet and tapering down toward the outlet of the casing, thereby preventing clogging of the material, said screw having a hole throughout its entire length, a rod passing through said hole and extending into the die beyond the outlet of the casing, means for revolving said difierential screw and means for holding therod and thereby preventing its revolution with the screw, substantially as described.

In testimony whereof we affix our signa tures in presence of two Witnesses.

GEORGE H. WADSWORTIL EDl/VARD J. SHERWIN. Witnesses: W. W. REED, L. F. GRISWOLD. 

